The brittleness of dental amalgam limits its use to sites in which tensile stresses can be kept at a minimum. If the cause for the brittleness could be ascertained, then an approach to correct this problem could be devised. Physical properties of metals are ultimately manifested in, and can be explained by, their microstructure. Through the work of several researchers,1-3 means of identifying t...

OBJECTIVE This article estimates the financial impact of a ban on amalgam restorations for selected population groups: the entire population, children, and children and women of childbearing age. METHODS Using claim and enrollment data from Delta Dental of Michigan, Ohio, and Indiana and the American Dental Association Survey of Dental Services Rendered, we estimated the per capita use and an...

Dental amalgam powder consisting of conventional, spherical-shaped alloy was prepared and added to the diet at the rate of 10% or 20% of the weight. An inorganic mercury compound, a solution of 10ppm or 20ppm of mercurous nitrate was also prepared for a comparative study. Five groups of rats were fed the test diet or test solution ad libitum for 8 weeks. Throughout the experiment, all rats were...

OBJECTIVES We present total mercury (THg) in blood of Canadians 6-79 years of age from the first to-date nationally-representative survey, the Canadian Health Measures Survey (CHMS). This analysis is particularly relevant in the context of recent changes to Health Canada's blood Hg guidance values. METHODS We used data from cycle 1 (2007-2009) of the CHMS, in particular focussing on 5,319 res...

Introduction: Sealing ability of a retrograde filling material is an important factor for a successful endodontic apicoectomy. The purpose of this in-vitro study was to compare the sealing ability of calcium enriched mixture (CEM) cement versus amalgam as root-end filling materials. Methods: A total of 36 canals of extracted maxillary central incisors were instrumented and obturated using later...

When serial neurocognitive assessments are performed, 2 main factors are of importance: test-retest reliability and practice effects. With children, however, there is a third, developmental factor, which occurs as a result of maturation. Child tests recognize this factor through the provision of age-corrected scaled scores. Thus, a ready-made method for estimating the relative contribution of d...

Eighteen cadavers from routine autopsy casework were subject to a study of tissue levels of total mercury in brain, thyroid, and kidney samples by atomic absorption. On these same cadavers, all dental amalgam fillings (the most important source of inorganic mercury exposure in the general population, according to the World Health Organization (WHO) were charted. Total mercury levels were signif...

The largest source of mercury located in dental amalgam fillings people. In this study, mercury level in saliva of amalgam and non-amalgam human were compared as well as the level of α amylase has been detected. Materialsand methods: The concentration of mercury, silver, and activity of amylase in saliva were measured in 55 adult study subjects. The mercury contents were determined by cold–vapo...

Environmental Health Perspectives • volume 121 | number 1 | January 2013 A 11 Ursinyova M, Masanova V, Palkovicova L, Wsolova L. 2006. The influence of mother’s dental amalgam fillings on prenatal and postnatal exposure of children to mercury [Abstract]. Epidemiology 17:S494–S495. Wannag A, Skjaeråsen J. 1975. Mercury accumulation in placenta and foetal membranes. A study of dental workers and ...

The placement of intermediary cement bases under deep preparations for amalgam restorations is a recommended procedure in restorative dentistry. The base is of low thermal conductivity and thus protects the pulp from thermal shock.1 Bases should also possess sufficient strength to withstand the forces of condensation and mastication transmitted through the amalgam restoration.2'3 The effect of ...